What does it mean for something to be elusive?

When something is described as elusive, it means that it is difficult to find, catch, or achieve. This term is often used to refer to concepts, ideas, or even physical objects that seem to evade capture or comprehension, illustrating their intangible or fleeting nature. In the context of the choices provided, the correct answer encapsulates this meaning perfectly, as “hard to catch” aligns with the idea of being difficult to grasp or attain.

The other choices present contrasting meanings. "Easy to understand" suggests clarity and straightforwardness, while "clearly visible" indicates that something can be seen without difficulty. "Commonly found" implies prevalence and accessibility, which directly opposes the concept of elusiveness. Thus, "hard to catch" is the only option that accurately reflects the meaning of elusive.